Google adsense had a Site maintenance on this Saturday but still after this maintainence google adsense has some problem at their side where in the channel details are not shown in many adsense publisher accounts.
I got IM’s from 4 publishers yesterday enquiring about this problem and if i was also having similar problem, and when i checked my account i found just 1 channel being shown in my adsense account. Lets wait to see a official update from google adsense team on this bug and wait and see when it gets sorted.
Also get ready for the Halloween costume on your adsense ads which come out every year during christmas festival time.